# US 8,543,064 B2 · Enhanced estimation of uplink interference coupling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,064 B2 - Document ID: US8543064B2 - Status: Granted - Kind: B2 - Application number: 13/036,464 - Filed: 2011-02-28 - Published: 2011-09-01 - Granted: 2013-09-24 - Earliest claimed: 2010-03-01 - Assignees: Nokia Siemens Networks Oy - Applicants: Klaus I. Pedersen; Istvan Z. Kovacs; Luis Garcia - Inventors: Klaus I. Pedersen; Istvan Z. Kovacs; Luis Garcia - Web page: https://patentgrep.com/patent/US8543064B2 ## CPC - H04J 11/0056: {Inter-base station aspects} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - H04L 5/1446: {of transmission speed} - H04W 52/243: {taking into account interferences} - H04W 52/34: TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading - H04W 52/346: {distributing total power among users or channels} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/541: using the level of interference - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Uplink interference coupling is estimated between a first cell and a second cell by adjusting downlink interference coupling between the cells at least according to user equipment UE transmit power per physical resource block PRB. This estimated uplink interference coupling is used to decide whether to take a component carrier into use in the first cell. In various embodiments: the uplink interference coupling is estimated by adjusting the downlink interference coupling according to transmit power per PRB of a first UE in the first cell and transmit power per PRB of a second UE in the second cell; and by further adjusting the downlink interference coupling according to path losses of the first and second UEs; and the transmit power per PRB as well as the path loss of the second UE is determined from signaling received in the first cell from the second UE operating in the second cell. ## Claims ### Claim 1 An apparatus comprising: a memory storing a program of computer instructions; and at least one processor; in which the memory and the program of computer instructions is configured with the at least one processor to cause the apparatus to at least: estimate uplink interference coupling between a first cell and a second cell by adjusting downlink interference coupling between the first and second cells at least according to user equipment transmit power per physical resource block; and decide whether to take a component carrier into use in the first cell based at least partly on the estimated uplink interference coupling. ### Claim 2 (depends on 1) The apparatus according to claim 1, in which the uplink interference coupling is estimated by adjusting the downlink interference coupling according to: transmit power per physical resource block of at least a first user equipment operating in the first cell; and transmit power per physical resource block of at least a second user equipment operating in the second cell. ### Claim 3 (depends on 2) The apparatus according to claim 2, in which the uplink interference coupling is estimated by further adjusting the downlink interference coupling according to path loss of the at least first user equipment and path loss of the at least second user equipment. ### Claim 4 (depends on 3) The apparatus according to claim 3, in which the transmit power per physical resource block of the at least second user equipment and the path loss of the at least second user equipment is determined from signaling received at the apparatus in the first cell from the at least second user equipment operating in the second cell. ### Claim 5 (depends on 1) The apparatus according to claim 1, in which: the uplink interference coupling comprises an uplink background interference matrix; and the downlink interference coupling comprises a downlink background interference matrix. ### Claim 6 (depends on 5) The apparatus according to claim 5, in which the estimated uplink interference coupling comprises an incoming uplink background interference matrix and an outgoing uplink background interference matrix; in which the memory and the program of computer instructions is configured with the at least one processor to cause the apparatus to estimate the incoming uplink background interference matrix using different user equipments in the first and second cells as compared to user equipments used to estimate the outgoing uplink background interference matrix. ### Claim 7 (depends on 6) The apparatus according to claim 6, in which the incoming uplink background interference matrix and the outgoing uplink background interference matrix are estimated according to: UL{1}←{2}≈DL{1}→{2}−PSDInterfered—own—largest—PL(B)+PSDInterferer—other(C)−Δ(PLB,PLC) UL{1}→{2}≈DL{1}←{2}+PSDInterferer(B)−PSDInterfered—other—largest—PL(D)+Δ(PLB,PLD); in which: UL{1}←{2} is the estimated incoming uplink background interference matrix; DL{1}→{2} is an outgoing downlink background interference matrix; PSD is power spectral density representing user equipment transmit power per physical resource block; PL is path loss; UL{1}→{2} is the estimated outgoing uplink background interference matrix; D{1}←{2} is an incoming downlink background interference matrix; B represents the first user equipment operating in the first cell; and C and D represent two user equipments operating in the second cell. ### Claim 8 (depends on 1) The apparatus according to claim 1, in which the apparatus comprises a network access node operating in the first cell. ### Claim 9 A method comprising: estimating uplink interference coupling between a first cell and a second cell by adjusting downlink interference coupling between the first and second cells at least according to user equipment transmit power per physical resource block; and deciding whether to take a component carrier into use in the first cell based at least partly on the estimated uplink interference coupling. ### Claim 10 (depends on 9) The method according to claim 9, in which the uplink interference coupling is estimated by adjusting the downlink interference coupling according to: transmit power per physical resource block of at least a first user equipment operating in the first cell; and transmit power per physical resource block of at least a second user equipment operating in the second cell. ### Claim 11 (depends on 10) The method according to claim 10, in which the uplink interference coupling is estimated by further adjusting the downlink interference coupling according to path loss of the at least first user equipment and path loss of the at least second user equipment. ### Claim 12 (depends on 11) The method according to claim 11, in which the transmit power per physical resource block of the at least second user equipment and the path loss of the at least second user equipment is determined from signaling received in the first cell from the at least second user equipment operating in the second cell. ### Claim 13 (depends on 9) The method according to claim 9, in which: the uplink interference coupling comprises an uplink background interference matrix; and the downlink interference coupling comprises a downlink background interference matrix. ### Claim 14 (depends on 13) The method according to claim 13, in which the estimated uplink interference coupling comprises an incoming uplink background interference matrix and an outgoing uplink background interference matrix; in which the incoming uplink background interference matrix is estimated using different user equipments in the first and second cells as compared to user equipments used to estimate the outgoing uplink background interference matrix. ### Claim 15 (depends on 14) The method according to claim 14, in which the incoming uplink background interference matrix and the outgoing uplink background interference matrix are estimated according to: UL{1}←{2}≈DL{1}→{2}−PSDInterfered—own—largest—PL(B)+PSDInterferer—other(C)−Δ(PLB,PLC) UL{1}→{2}≈DL{1}←{2}+PSDInterferer(B)−PSDInterfered—other—largest—PL(D)+Δ(PLB,PLD); in which: UL{1}←{2} is the estimated incoming uplink background interference matrix; DL{1}→{2} is an outgoing downlink background interference matrix; PSD is power spectral density representing user equipment transmit power per physical resource block; PL is path loss; UL{1}→{2} is the estimated outgoing uplink background interference matrix; DL{1}←{2} is an incoming downlink background interference matrix; B represents the first user equipment operating in the first cell; and C and D represent two user equipments operating in the second cell. ### Claim 16 (depends on 9) The method according to claim 9, in which the estimated uplink interference coupling is specific to one user equipment operating in the first cell such that the decided component carrier has a maximum re-use of one among at least the first and second cells. ### Claim 17 A memory storing a program of computer instructions that when executed by a processor result in actions directed toward evaluating a component carrier for use, the actions comprising: estimating uplink interference coupling between a first cell and a second cell by adjusting downlink interference coupling between the first and second cells at least according to user equipment transmit power per physical resource block; and deciding whether to take a component carrier into use in the first cell based at least partly on the estimated uplink interference coupling. ### Claim 18 (depends on 17) The memory according to claim 17, in which the uplink interference coupling is estimated by adjusting the downlink interference coupling according to: transmit power per physical resource block of at least a first user equipment operating in the first cell; and transmit power per physical resource block of at least a second user equipment operating in the second cell. ### Claim 19 (depends on 18) The memory according to claim 18, in which the uplink interference coupling is estimated by further adjusting the downlink interference coupling according to path loss of the at least first user equipment and path loss of the at least second user equipment. ### Claim 20 (depends on 19) The memory according to claim 19, in which the transmit power per physical resource block of the at least second user equipment and the path loss of the at least second user equipment is determined from signaling received in the first cell from the at least second user equipment operating in the second cell.